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关于UCC28180 设计9KW AC/DC电源时,输出电压不正确,帮忙分析原因

Other Parts Discussed in Thread: UCC28180

你好, 附件是我这边客户的原理图,目前设计要求如下:

1、  输出电压      380VDC

2、  最大输出功率  9000W

3、  输入电压      187-260VAC / 50-60 HZ

4、开关频率       20KHZ

设计

Cicomp = 1000PF;

Rcv = 13K

Ccv1 = 100000PF

Ccv2 = 10000pf

实际测试中问题:

1、  样板测试,在空载或者负载1KW时,VFB电气脚稳定在4.6V,非理论上的5V;

2、  调试时,强制把VFB电点拉到5V,第8脚gate关闭输出;

敬请各位大神帮忙分析一下,万分感谢,项目比较急

DAHUA-UCC28180 V1.0.pdf